Why is the ninth month called September?
early 14c. "administration of justice" (attested from mid-13c. in Anglo-Latin), from Old French juridiccion (13c.) and directly from Latin iurisdictionem (nominative iurisdictio) "administration of justice, jurisdiction," from ius (genitive iuris; see jurist) "right, law" + dictio "a saying" (see diction). Meaning "extent or range of administrative power" is from late 14c. Related: Jurisdictional.